Add cross-platform support to decky (#387)

* Import generic watchdog observer over platform specific import

* Use os.path rather than genericpath

* Split off socket management in plugin.py

* Don't specify multiprocessing start type

Default on linux is already fork

* Move all platform-specific functions to seperate files

TODO: make plugin.py platform agnostic

* fix import

* add backwards compat to helpers.py

* add backwards compatibility to helpers.py harder

* Testing autobuild for win

* Testing autobuild for win, try 2

* Testing autobuild for win, try 3

* Testing autobuild for win, try 4

* Create the plugins folder before attempting to use it

* Implement win get_username()

* Create win install script

* Fix branch guess from version

* Create .loader.version in install script

* Add .cmd shim to facilitate auto-restarts

* Properly fix branch guess from version

* Fix updater on windows

* Try 2 of fixing updates for windows

* Test

* pain

* Update install script

* Powershell doesn't believe in utf8

* Powershell good

* add ON_LINUX variable to localplatform

* Fix more merge issues

* test

* Move custom imports to main.py

* Move custom imports to after __main__ check 

Due to windows' default behaviour being spawn, it will spawn a new process and thus import into sys.path multiple times

* Log errors in get_system_pythonpaths() and get_loader_version() + 

split get_system_pythonpaths() on newline

* Remove whitespace in result of get_system_pythonpaths()

* use python3 on linux and python on windows in get_system_pythonpaths()

* Remove fork-specific urls

* Fix MIME types not working on Windows

backend/browser.py

@@ -12,12 +12,12 @@ from io import BytesIO
 from logging import getLogger
 from os import R_OK, W_OK, path, rename, listdir, access, mkdir
 from shutil import rmtree
-from subprocess import call
 from time import time
 from zipfile import ZipFile
+from localplatform import chown, chmod
 
 # Local modules
-from helpers import get_ssl_context, get_user, get_user_group, download_remote_binary_to_path
+from helpers import get_ssl_context, download_remote_binary_to_path
 from injector import get_gamepadui_tab
 
 logger = getLogger("Browser")
@@ -43,10 +43,9 @@ class PluginBrowser:
         zip_file = ZipFile(zip)
         zip_file.extractall(self.plugin_path)
         plugin_dir = path.join(self.plugin_path, self.find_plugin_folder(name))
-        code_chown = call(["chown", "-R", get_user()+":"+get_user_group(), plugin_dir])
-        code_chmod = call(["chmod", "-R", "555", plugin_dir])
-        if code_chown != 0 or code_chmod != 0:
-            logger.error(f"chown/chmod exited with a non-zero exit code (chown: {code_chown}, chmod: {code_chmod})")
+
+        if not chown(plugin_dir) or not chmod(plugin_dir, 555):
+            logger.error(f"chown/chmod exited with a non-zero exit code")
             return False
         return True
     
@@ -61,14 +60,14 @@ class PluginBrowser:
                     packageJson = json.load(f)
                     if "remote_binary" in packageJson and len(packageJson["remote_binary"]) > 0:
                         # create bin directory if needed.
-                        rc=call(["chmod", "-R", "777", pluginBasePath])
+                        chmod(pluginBasePath, 777)
                         if access(pluginBasePath, W_OK):
                             
                             if not path.exists(pluginBinPath):
                                 mkdir(pluginBinPath)
                             
                             if not access(pluginBinPath, W_OK):
-                                rc=call(["chmod", "-R", "777", pluginBinPath])
+                                chmod(pluginBinPath, 777)
 
                         rv = True
                         for remoteBinary in packageJson["remote_binary"]:
@@ -80,8 +79,8 @@ class PluginBrowser:
                                 rv = False
                                 raise Exception(f"Error Downloading Remote Binary {binName}@{binURL} with hash {binHash} to {path.join(pluginBinPath, binName)}")
 
-                        code_chown = call(["chown", "-R", get_user()+":"+get_user_group(), self.plugin_path])
-                        rc=call(["chmod", "-R", "555", pluginBasePath])
+                        chown(self.plugin_path)
+                        chmod(pluginBasePath, 555)
                     else:
                         rv = True
                         logger.debug(f"No Remote Binaries to Download")